<?php
/**
 * 环境角色 calculation（计算器）
 * @author Kenny Wang
 */
class  Calc {

	public static $add   = null;
	public static $sub   = null;
	public static $multi = null;
	public static $div   = null;

	function __construct(){
		self::$add   = new Add();
		self::$sub   = new Sub();
		self::$multi = new Multi();
		self::$div   = new Div();
	}
}